Every internal combustion engine has one cylinder that runs hot. Doesn't
matter if its air or water cooled.
The engineering isn't that finite to make them all run at the same
temperature.
The options are: #1, #2 or #4 fail first.
Fourteen cylinder Prat and Whitney engines had one or two cylinders that
ran hot, Lycombing, Continental and all other piston aircraft engines all
have one or more cylinder that runs hot ........ Exhaust gas temperature
gauges report this and tell the pilot to ritchen up or go down in flames.
If you submerged your VW engine in a swimming pool and ran it you'd still
get one cylinder that ran hotter than the others ......... engineering
foible.

Stan Wilder, not an engineer.

On Fri, 25 Jan 2002 18:45:19 -0500 Richard Golen <rgolen@UMASSD.EDU>
writes:
> On the Type I and Type II upright engines, the oil cooler was in the
> path
> of the air that cooled number 3 cylinder, as a result #3 always ran
> hotter
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